Industrial Area—75DB to 70Db (Day time-6am to 10pm and night time 10pm to 6am ..75 is day time and 70 is night time)

Commercial Area–65 to 55

Residential Area–55 to 45

Silence Zone– 50 to 40

The Government of India on Mar 2011 launched a Real time Ambient Noise Monitoring Network.

Under this network, in phase- I, five Remote Noise Monitoring Terminals each have been installed in different noise zones in seven metros (Delhi, Hyderabad, Kolkata, Mumbai, Bangalore, Chennai and Lucknow).

In Phase II another 35 monitoring stations will be installed in the same seven cities.